Engine Controls - Tests W/codes: Other Infiniti J30 I

CONSULT TESTER

In addition to self-diagnostic capability, all models are equipped with a Data Link Connector (DLC) for use with CONSULT Tester (J-38465). DLC is located in left dash side panel.

Note. When performing BASIC DIAGNOSTIC PROCEDURES, DO NOT erase any diagnostic information stored in ECM memory.

Note. CHECK ENGINE light is now referred to as Malfunction Indicator Light (MIL).

HARD FAILURES

Hard failures cause Malfunction Indicator Light (MIL) to glow and remain on until problem is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic code charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, vehicle runs but driveability will not be optimum.

INTERMITTENT FAILURES

Intermittent failures may cause Malfunction Indicator Light (MIL) to flicker or glow and go out after intermittent fault goes away. However, corresponding trouble code will be stored in ECM memory. Not all trouble codes will illuminate MIL. If related fault does not reoccur within a certain time frame, related trouble code will be erased from ECM memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See INTERMITTENTS in TESTS W/O CODES article.

Note. Follow proper diagnostic routine when diagnosing system. See DIAGNOSTIC ROUTINE table.

DIAGNOSTIC ROUTINE

MALFUNCTION INDICATOR LIGHT (MIL)

Note. Not all trouble codes activate MIL.

All models are equipped with a Malfunction Indicator Light (MIL). As a bulb check, light glows when ignition is turned on and engine is not running.

On California models, MIL glows when a fault is detected with engine running. A corresponding trouble code will set in ECM memory. MIL also glows if ECM or camshaft/crankshaft position sensor malfunctions.

On Federal models, MIL glows only when ECM or camshaft/crankshaft position sensor malfunctions with engine running.

Mode I

This is normal operating mode. In this mode, Malfunction Indicator Light (MIL) and Red LED inspection light in ECM stay on when ignition is turned on, engine off (bulb check). If engine is started, MIL and Red LED in ECM should turn off, unless a fault or trouble code is present (California) or if ECM or camshaft/crankshaft position sensor is malfunctioning (California and Federal).

Mode II

This is self-diagnostic mode for retrieving fault or trouble codes. See RETRIEVING CODES. With engine running, Mode II can monitor air/fuel mixture feedback control. MIL and Red LED in ECM will flash on (lean) and off (rich) more than 5 times every 10 seconds with engine speed at 2000 RPM when system is in closed loop. MIL and Red LED do not flash (remain on or off) if system is in open loop.

RETRIEVING CODES

Use Mode II to retrieve trouble codes. Read codes using either Malfunction Indicator Light (MIL) or Red LED inspection light on ECM. Trouble codes will flash after selecting Mode II.

Trouble codes are indicated by number of flashes from MIL or Red LED inspection light. For example, 3 long (.6 second) flashes followed by 2 short (.3 second) flashes of MIL or Red LED indicate a Code 32. There will be a .9 second pause between long and short flash groups. There will be a 2.1 second pause between codes.

CLEARING CODES

Note. Ensure all diagnostic codes are accessed from ECM memory before disconnecting battery or switching from Mode II to Mode I.

Memory Erase

Stored memory can be erased by disconnecting battery or selecting Mode I after Mode II has been accessed.

FINAL CHECK FOR ALL CODE CHARTS

Unless otherwise instructed in code inspection, perform following FINAL CHECK after each repair is completed.

1. Erase Diagnostic Test Mode II (Self-Diagnostic Results) memory. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM.
2. Ensure Code 55 (no malfunction) is displayed in self- diagnostic mode.
3. Perform a test drive.
4. Perform Diagnostic Test Mode II (Self-Diagnostic Results) again. If results are okay, inspection is complete. If results are not okay, verify ECM pin terminals or harness connector are not damaged.

SUMMARY

If no hard fault codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

1) Check Power Supply

Turn ignition off and disconnect CKP sensor harness connector. Turn ignition on. Measure voltage between CKP sensor harness connector terminal "b" (Black/White wire) and ground. (Scheme 4)and (Scheme 5). If battery voltage is present, go to next step. If battery voltage is not present, verify harness continuity between CKP sensor and ECCS relay (Black/White wire), and between CKP sensor and ECM (Black/White wire). Repair harness or connectors as necessary.

Scheme 4

Scheme 5

2) Check Input Signal Circuit

Turn ignition off and disconnect ECM harness connector. Verify harness continuity between CKP sensor connector terminal "d" (Green/Black wire) and ECM connector terminals No. 41 and 51 (120-degree signal), and between terminal "c" (Green/Yellow wire) and ECM terminals No. 42 and 52 (one degree signal). see scheme 2, see scheme 3 and (Scheme 6). If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

3) Check Component

Inspect CKP sensor. See SYSTEM & COMPONENT TESTING article. Replace CKP sensor if necessary and perform FINAL CHECK.

Scheme 6

Turn ignition off and disconnect MAF sensor harness connector. Turn ignition on. Measure voltage between MAF sensor harness connector terminal "b" (Black/White wire) and ground. (Scheme 7)and (Scheme 8). If battery voltage is present, go to next step. If battery voltage is not present, verify harness continuity between MAF sensor and ECM, and MAF sensor and ECCS relay. Repair harness or connectors as necessary.

Scheme 7

Scheme 8

Turn ignition off and disconnect ECM harness connector. Check continuity between MAF sensor connector terminal "e" (White wire) and ECM terminal No. 27. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary. see scheme 2, see scheme 3 and (Scheme 9).

Inspect MAF sensor. See SYSTEM & COMPONENT TESTING article. Replace MAF sensor if necessary and perform FINAL CHECK.

Scheme 9

Turn ignition off and disconnect ECT sensor harness connector. Turn ignition on. Measure voltage between ECT sensor harness connector terminal "b" (Yellow/Green wire) and ground. (Scheme 10)and (Scheme 11). If voltage is approximately 5 volts, go to next step. If voltage is not as specified, verify harness continuity between ECT sensor and ECM. Repair harness or connectors as necessary.

Scheme 10

Scheme 11

2) Check Ground Circuit

Turn ignition off. Check ECT sensor harness continuity between terminal "a" (Orange/Blue wire) and engine ground. (Scheme 12) If continuity is present, go to next step. If continuity is not present, verify harness continuity between ECT sensor terminal "a" and ECM terminal No. 30 (Orange/Blue wire), and between automatic transmission control unit terminal No. 35 (48-pin connector located on driver side kick panel) and ECT sensor terminal "a" (Orange/Blue wire). Repair harness or connectors as necessary.

Inspect ECT sensor. See I - SYS/COMP TESTS article. Replace ECT sensor if necessary and perform FINAL CHECK.

Scheme 12

Turn ignition off and disconnect ECM harness connector and combination meter harness connector. Check harness continuity between ECM terminal No. 53 and combination meter terminal "a" (Black/Yellow wire). see scheme 2, see scheme 3, (Scheme 13) and (Scheme 14). If continuity is not present, repair harness or connectors as necessary and perform FINAL CHECK.

Scheme 13

Scheme 14

1) Start engine.

If engine does not start, go to next step. If engine starts, go to step 3) or to step 4).

If engine does not start, turn ignition off. Disconnect Power Transistor Unit (PTU) harness connector. Verify harness continuity between PTU harness connector terminal "d" (Black wire) and engine ground. (Scheme 15)-19. If continuity is present, go to step 4). If continuity is not present, repair harness or connectors as necessary and perform FINAL CHECK.

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

3) Search For Malfunctioning Circuit Using CONSULT

Turn ignition off and connect CONSULT. Perform POWER BALANCE in ACTIVE TEST mode with CONSULT. Search for circuit which does not produce a momentary engine speed drop.

4) Check Output Signal Circuit

Turn ignition off. Disconnect ECM harness connector and PTU harness connector. Verify harness continuity between ECM harness connector terminals and PTU harness connector terminals as follows

1. ECM terminal No. 1 and PTU terminal "g" (Yellow wire).
2. ECM terminal No. 2 and PTU terminal "f" (Light Green/Black wire).
3. ECM terminal No. 3 and PTU terminal "e" (White wire).
4. ECM terminal No. 11 and PTU terminal "c" (Pink/Black wire).
5. ECM terminal No. 12 and PTU terminal "b" (Red/Blue wire).
6. ECM terminal No. 13 and PTU terminal "a" (Gray wire).

(Scheme 20) If continuity is present, go to next step. If continuity is not present, verify harness continuity between ECM connector and PTU connector. Repair harness or connectors as necessary.

5) Check Component

Inspect power transistor unit. See SYSTEM & COMPONENT TESTING article. Replace power transistor unit if necessary and perform FINAL CHECK.

Scheme 20

1) Check Vacuum Source To EGR Valve

Start engine and bring to operating temperature. With engine speed at about 2000 RPM, disconnect vacuum hose to EGR valve. (Scheme 21) If vacuum is not present, go to next step. If vacuum is present, inspect EGR valve. See SYSTEM & COMPONENT TESTING article. Replace EGR valve if necessary and perform FINAL CHECK.

Scheme 21

2) Check Control Function

If vacuum is not present, with engine running, measure voltage between ECM terminal No. 102 (Red/Black wire) and ground. At idle, voltage should be zero volts. At 2000 RPM, voltage should be battery voltage. (Scheme 22) If voltage measured is not as specified, go to next step. If voltage is as specified, inspect vacuum hose for clogging, cracks or proper connection. Repair vacuum hose as necessary.

Scheme 22

3) Check Output Signal Circuit

Turn engine off and disconnect ECM harness connector. Disconnect EGR control solenoid valve harness connector. Verify harness continuity between ECM terminal No. 102 (Red/Black wire) and ground, and between EGR control solenoid valve harness connector terminal "a" (Red/Black wire) and ground. (Scheme 23)and (Scheme 24). If continuity does not exist, go to next step. If there is continuity, repair harness or connectors between ECM and EGR control solenoid valve as necessary.

Scheme 23

Scheme 24

4) Check Component

Inspect EGR control solenoid valve. See SYSTEM & COMPONENT TESTING article. Replace EGR control solenoid valve if necessary and perform FINAL CHECK.

5) Check Component Using CONSULT

Turn ignition off and connect CONSULT. Connect ECM harness connector and EGR control solenoid valve harness connector. Turn ignition on. Using CONSULT, perform EGRC SOL/V CIRCUIT in FUNCTION TEST mode. Replace EGR control solenoid valve if necessary.

Another method is to turn EGR and canister control solenoid valve ON and OFF using CONSULT in ACTIVE TEST mode. Replace EGR control solenoid valve if operating sounds are not heard. Perform FINAL CHECK.

1) Check Input Signal Circuit

Turn ignition off and disconnect HO2S harness connector and ECM harness connector. Verify harness continuity between ECM connector terminals No. 29 (right), No. 55 (left) and HO2S connector terminal "b" (White wire). (Scheme 25), (Scheme 26) and (Scheme 27). If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

Scheme 25

Scheme 26

Scheme 27

2) Check Voltage

Connect HO2S harness connector and ECM harness connector. Bring engine to operating temperature and hold speed at approximately 2000 RPM. Using an analog voltmeter, measure voltage between ECM terminals No. 29 and 55 (White wire) and ground. (Scheme 28) If voltage measured is approximately.3 volt and there are no voltage fluctuations, replace HO2S. If voltage fluctuates between approximately.2-.9 volt, HO2S is okay. Perform FINAL CHECK.

Scheme 28

3) Check Voltage Using CONSULT

Turn ignition off. Connect CONSULT, HO2S harness connector and ECM harness connector. Start engine, bring to operating temperature and hold speed at 2000 RPM. Select DATA MONITOR mode with CONSULT. Touch RECORD. Check O2 SEN (-R) voltage. If voltage displayed is approximately .3 volt and there are no voltage fluctuations, replace HO2S. If voltage displayed fluctuates between approximately .2-.9 volt, HO2S is okay. Perform FINAL CHECK.

1) Check Input Signal Circuit I

Turn ignition off. Disconnect ECM harness connector and knock sensor sub-harness connector. Verify harness continuity between knock sensor sub-harness connector terminal "b" (White wire) and ECM terminal No. 23. see scheme 2, see scheme 3, 29and 30. If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

2) Check Input Signal Circuit II

Disconnect knock sensor harness connector from sub-harness. Verify harness continuity between sub-harness terminal "c" and knock sensor harness connector terminal "f" (White wire). (Scheme 31) If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

Inspect knock sensor. See SYSTEM & COMPONENT TESTING article. Replace knock sensor if necessary and perform FINAL CHECK.

Scheme 29

Scheme 30

Scheme 31

Turn ignition off and disconnect EGR temperature sensor harness connector. Turn ignition on. Measure voltage between EGR temperature sensor connector terminal "b" (Brown wire) and ground. (Scheme 32)and (Scheme 33). If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.

Scheme 32

Scheme 33

Turn ignition off. Verify harness continuity between EGR temperature sensor connector terminal "a" (Orange/Blue wire) and engine ground. (Scheme 34) If continuity is present, go to next step. If continuity is not present, verify harness continuity between EGR temperature sensor terminal "a" and ECM terminal No. 30 (Orange/Blue wire), and between automatic transmission control unit terminal No. 35 (48-pin connector located on driver side kick panel) and EGR temperature sensor terminal "a" (Orange/Blue wire). If continuity is not present, repair harness or connectors as necessary.

Inspect EGR temperature sensor. See SYSTEM & COMPONENT TESTING article. Replace EGR temperature sensor if necessary and perform FINAL CHECK.

Scheme 34

Turn ignition off and disconnect fuel temperature sensor harness connector. Turn ignition on. Measure voltage between terminal "a" (White wire) and ground. If voltage is approximately 5 volts, go to next step. If voltage is not as specified, verify harness continuity in harness and connectors between ECM terminal No. 36 (White wire) and fuel temperature sensor. Repair harness or connectors as necessary. see scheme 2, see scheme 3, (Scheme 35) and (Scheme 36).

2) Check Component

Inspect fuel temperature sensor. See SYSTEM & COMPONENT TESTING article. Replace fuel temperature sensor if necessary and perform FINAL CHECK.

Scheme 35

Scheme 36

Turn ignition off and disconnect TPS harness connector. Turn ignition on. Measure voltage between TPS connector terminal "c" (Green wire) and ground. (Scheme 37)and (Scheme 38). If voltage is approximately 5 volts, go to next step. If voltage is not as specified, repair harness or connectors as necessary.

Scheme 37

Scheme 38

Turn ignition off. Verify harness continuity between TPS connector terminal "a" (Orange/Blue wire) and engine ground. (Scheme 39) If continuity is present, go to next step. If continuity is not present, verify harness continuity between TPS terminal "a" and ECM terminal No. 30 (Orange/Blue wire), and between automatic transmission control unit terminal No. 35 (48-pin connector located on driver side kick panel) and TPS terminal "b" (Orange/Blue wire). If continuity is not present, repair harness or connectors as necessary.

Scheme 39

3) Check Input Signal Circuit

Disconnect ECM harness connector. see scheme 2 Verify harness continuity between ECM connector terminal No. 38 and TPS connector terminal "b" (Black wire). see scheme 3and (Scheme 40). If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

Inspect TPS. See SYSTEM & COMPONENT TESTING article. Replace TPS if necessary and perform FINAL CHECK.

Scheme 40

1) Clear Self-Learning Data

Clear self-learning data. Start engine and bring to operating temperature. Stop engine and disconnect Mass Airflow (MAF) sensor connector. Start engine and run for at least 30 seconds at 2000 RPM. (Scheme 41) Stop engine and connect MAF sensor connector. Ensure DTC 12 is displayed in Diagnostic Test Mode II. Erase self-diagnostic memory. Ensure DTC 55 is displayed in Diagnostic Test Mode II. See ENTERING SELF-DIAGNOSTICS.

2) Clear Self-Learning Data Using CONSULT

Select SELF-LEARNING CONT in ACTIVE TEST mode with CONSULT. Clear self-learning control coefficient by touching CLEAR.

Scheme 41

1) Search For Malfunctioning Circuit

Using a listening device, search for circuit which does not produce injector operating sound at idle. (Scheme 42)

2) Search For Malfunctioning Circuit Using CONSULT

Perform POWER BALANCE in ACTIVE TEST mode. Search for circuit which does not produce a momentary engine speed drop.

Scheme 42

3) Check Circuit Continuity I

Turn ignition off. Disconnect EFI sub-harness connectors (Brown and Gray connectors). (Scheme 43) Verify harness continuity between Brown connector (injector side) terminal "e" (Red/Black wire) and Gray connector terminals "i" (Pink/Black wire), "j" (White wire), "k" (Light Green/Black wire), "l" (Yellow wire), "o" (Gray wire) and "p" (Red/Blue wire). (Scheme 44) If continuity is not present, go to next step. If continuity is present, go to step 6).

Scheme 43

Scheme 44

4) Check Circuit Continuity II

Disconnect injector harness connectors. (Scheme 45) Verify harness continuity between Brown connector (injector side) terminal "e" and each injector harness connector terminal "r" (Red/Black wire). Verify harness continuity between each injector terminal "q" and Gray connector terminals "i" (Pink/Black wire), "j" (White wire), "k" (Light Green/Black wire), "l" (Yellow wire), "o" (Gray wire) and "p" (Red/Blue wire). (Scheme 46)

Scheme 45

Scheme 46

Inspect each injector. See SYSTEM & COMPONENT TESTING article. Replace injector(s) if necessary.

6) Check Output Signal Circuit

Turn ignition off. Disconnect ECM harness connector. Verify harness continuity between ECM harness connector terminals and ECM side of EFI Gray connector terminals as follows

1. ECM terminal No. 101 and EFI terminal "s" (Yellow wire).
2. ECM terminal No. 103 and EFI terminal "u" (White wire).
3. ECM terminal No. 105 and EFI terminal "w" (Red/Blue wire).
4. ECM terminal No. 110 and EFI terminal "t" (Light Green/Black wire).
5. ECM terminal No. 112 and EFI terminal "v" (Pink/Black wire).
6. ECM terminal No. 114 and EFI terminal "x" (Gray wire).

(Scheme 47) If continuity is not present, repair harness or connectors as necessary. If continuity is present, inspect ECM pin terminals for damage or check for bad connection of ECM harness connector. Perform FINAL CHECK.

Scheme 47

Check Input Signal Circuit

Turn ignition off. Disconnect ECM harness connector and A/T control unit harness connector. Verify harness continuity between ECM connector terminal No. 5 and A/T control unit connector terminal No. 10 (Blue/Black wire). Verify harness continuity between ECM connector terminal No. 14 and A/T control unit connector terminal No. 11 (Pink/Blue wire). (Scheme 48)and (Scheme 49). If continuity is present, perform FINAL CHECK. If continuity is not present, check connectors between ECM and A/T control unit. Repair harness or connectors as necessary and perform FINAL CHECK.

Scheme 48

Scheme 49

If no hard fault codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.